Intercalibration and Co-Registration of the LASCO, UVCS and SUMER instruments on SOHO

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Session 37 - First Results from the Solar and Heliospheric Observatory (SOHO).
Display session, Tuesday, June 11
Tripp Commons,

[37.06] Intercalibration and Co-Registration of the LASCO, UVCS and SUMER instruments on SOHO

J. Michels, J. L. Kohl (CfA), G. Noci (U. Florence), E. Antonucci (U. Turin), G. Tondello (U. Padua), M. C. E. Huber (ESA), W. Curdt (Max-Planck-Lindau), J. Hollandt (PBT), P. Lemaire (CNRS), U. Schühle, K. Wilhelm (Max-Planck-Lindau), C. Korendyke (NRL), T. Moran (ARC), J. C. Raymond (CfA), M. Romoli (U. Florence), C. Benna (U. Turin), A. Ciaravella (U. Palermo), S. Fineschi, L. D. Gardner (CfA), S. Giordano (U. Turin), G. Naletto, P. Nicolosi (U. Padua), O. H. W. Siegmund (UCB), D. Spadaro (OAC), P. L. Smith, L. Strachan (CfA)

Joint observations of equatorial streamers by three SOHO instruments have been used for radiometric intercalibration, co-registration and other spectroscopic comparisons. The results are used to track the stability of the radiometric calibrations of the Ultraviolet Coronagraph Spectrometer (UVCS) and the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) experiment at overlapping wavelenghs. Observations of equatorial streamers at heliocentric heights from 1.25 to 1.5 R_\sun are used for the intercalibrations. The results are compared to pre-launch laboratory calibrations and to observations of stars. The first stellar observation was for 38 AQI. These UV observations are compared to coronal green line (Fe XIV) observations obtained with the Large Angle Spectrometric Coronagraph (LASCO) C1 coronagraph obtained in the same time frame. Intercomparisons of spectral line profiles among LASCO, SUMER, and UVCS are also planned. The LASCO research is supported by NASA Grant NDPR S92835D; the UVCS research is supported by NASA Contract NAS5-31250 to the Smithsonian Astrophysical Observatory, by the Italian Space Agency and by Switzerland, and SUMER is financially supported by BMFT/DARA, CNES, NASA and PRODEX (Swiss Contribution).

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